| CD Glazing Ltd | Construction | 2017 |
| CDW Watford Ltd | Wholesale & retail | 2024 |
| CE1 Electrical Ltd | Construction | 2019 |
| Cedar Property Investments Ltd | Real estate | 2025 |
| Cedars Court Management Company Limited | Professional & scientific | 2007 |
| Cedars Drive Residents Association Limited | Households | 1980 |
| Cedrus Flow Ltd | Information & communication | 2026 |
| Celltrion Healthcare United Kingdom Limited | Wholesale & retail | 2018 |
| Celsius Climate Solutions Limited | Construction | 2020 |
| Celya D Ltd | Other services | 2017 |
| Centraa Ltd | Wholesale & retail | 2019 |
| Central Bedrooms and Kitchens Limited | Manufacturing | 2010 |
| Central Estate Agents Ltd | Real estate | 2024 |
| Central Traders Ltd | Administrative & support | 2007 |
| Central Welling Limited | Wholesale & retail | 2019 |
| Centre for Integral Transformation Limited | Information & communication | 2006 |
| Centurian Ltd | Construction | 2025 |
| Centurian Surfacing Limited | Construction | 2014 |
| Century Energy Partners Limited | Financial services | 2013 |
| Century Windows Limited | Other services | 2003 |
| Ceramic Safe Limited | Manufacturing | 2025 |
| Certax Accounting (West London) Ltd | Information & communication | 2021 |
| Ceylon Tea and Herbs UK Ltd | Wholesale & retail | 2023 |
| CF Planning Ltd | Construction | 2024 |
| CFB Rail Ltd | Manufacturing | 2015 |
| CFC Logic Holdings Ltd | Financial services | 2019 |
| CFC Logic Ltd | Professional & scientific | 2013 |
| CG Consultancy Ltd | Other services | 2012 |
| CG Scenic Eminence Ltd | Information & communication | 2024 |
| Cgeese International UK Ltd | Financial services | 2021 |
| CGN Violins Limited | Manufacturing | 2012 |
| CH Logistics & Distribution Ltd | Transport & logistics | 2025 |
| Chadha Group Ltd | Financial services | 2020 |
| Chahal Empire Limited | Real estate | 2021 |
| Chahal Living Limited | Real estate | 2026 |
| Chahal LIVING1 Limited | Real estate | 2026 |
| Chai Mast Bake Shop Ltd | Wholesale & retail | 2025 |
| Chaichi Limited | Hospitality | 2020 |
| Chakar Pharmaceutical Ltd | Wholesale & retail | 2024 |
| Chakar Solutions Ltd | Professional & scientific | 2018 |
| Chalfont Coaching Ltd | Arts & recreation | 2024 |
| Chalfont Court RTM Company Limited | Households | 2006 |
| Chalfont Road Management Limited | Real estate | 1988 |
| Chamber Collective Ltd | Transport & logistics | 2024 |
| CHAMP-3D Limited | Information & communication | 2013 |
| Chandi Development Limited | Construction | 2025 |
| Chandni Food & Wine Limited | Wholesale & retail | 2025 |
| Channi Thind Bricklayer & Construction Ltd | Construction | 2023 |
| Channi Thind Construction Ltd | Construction | 2024 |
| Charcode Ltd | Information & communication | 2025 |
| Chardikala Services Ltd | Transport & logistics | 2020 |
| Chardikala Traders Ltd | Administrative & support | 2012 |
| Charge Properties Ltd | Households | 2024 |
| Charlene Consultancy Limited | Professional & scientific | 2021 |
| Charles Edwards (Antiques) Holdings Limited | Financial services | 2023 |
| Charles IT Solutions Limited | Professional & scientific | 2018 |
| Charlotte Annette Furness Burrows Limited | Extraterritorial | 2023 |
| Charlotte's Sourdough Ltd | Wholesale & retail | 2020 |
| Chartis Holdings Limited | Administrative & support | 2019 |
| Chase Motor Finance Limited | Wholesale & retail | 2025 |
| Chattels Investments Limited | Real estate | 2024 |
| Chattels Security & Services Ltd | Transport & logistics | 2014 |
| Chaudhary Construction Group Limited | Construction | 2026 |
| Chaudhry Fabrics UK Ltd | Wholesale & retail | 2023 |
| Chayil Consulting Limited | Professional & scientific | 2013 |
| Checked and Tested Ltd | Professional & scientific | 2026 |
| Cheddar Gourmet Ltd | Hospitality | 2021 |
| Cheema Carpet&Flooring Limited | Wholesale & retail | 2025 |
| Cheema Consultancy Ltd | Information & communication | 2018 |
| Chelsea Close Management Limited | Households | 1987 |
| Chelsea Finishes Ltd | Real estate | 2025 |
| Chelsea Knight Ltd | Real estate | 2015 |
| Chelsea Rose Collective Ltd | Professional & scientific | 2021 |
| Chelssea Limited | Water & waste | 2025 |
| Cherry Corner (Management) Company Limited | Real estate | 1983 |
| Cherub Properties Ltd | Real estate | 2019 |
| Chesterton Court Management (High Wycombe) Limited | Households | 2002 |
| Chettinad House Ltd | Wholesale & retail | 2021 |
| Chiic Investments Limited | Real estate | 2021 |
| Chilivasli Ltd | Wholesale & retail | 2025 |
| Chilli Indian Takeaway Ltd | Hospitality | 2019 |
| Chilli Milli Limited | Wholesale & retail | 2025 |
| Chilli Pepper Facilities Management (Cpfm) Ltd | Construction | 2001 |
| Chilli Scenery Ltd | Construction | 2022 |
| Chiltern Fleet Solutions Limited | Wholesale & retail | 2017 |
| Chiltern Heights Management Company Limited | Real estate | 2006 |
| Chiltern Private Limited | Health & social care | 2024 |
| Chime Time Care Ltd | Health & social care | 2018 |
| Chimney Rigging Ltd | Construction | 2013 |
| China Business Limited | Administrative & support | 2009 |
| Chinnor Services Limited | Construction | 2026 |
| Chisel Sourcing UK Limited | Professional & scientific | 2023 |
| Chop Meats Limited | Wholesale & retail | 2021 |
| Chopra Assets Ltd | Real estate | 2026 |
| Chosen Solutions Ltd | Information & communication | 2016 |
| Chox Landmark Ltd. | Real estate | 2024 |
| Chris Huen SIN KAN Studio Limited | Arts & recreation | 2021 |
| Christenvie Blessing Nkoy Ltd | Other services | 2024 |
| Christoph Ingenhoven Architects Ltd | Extraterritorial | 2016 |
| Chromium Acquisitions Limited | Financial services | 2009 |